JPH08215932A - Method for cutting side surface with circular saw and a circular saw used for it - Google Patents

Abstract

PURPOSE: To secure a good cutting force even by a fixed supporter without rigidity such as a robot arm by reducing a bending stress acting on the base plate of a circular saw so as to maintain the sharpness and strength of the edge of the saw. CONSTITUTION: When an aluminum cast or a die cast supported on a robot am is cut, a circular saw A in which sintered diamond chips 2 are arranged on the outer periphery of a base plate 1 at an axial rake angle Q1 of 0 to 5 deg. and a radial rake angle Q0 of 5 to 10 deg. is used to cut side surfaces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for single-sided cutting of cast aluminum or aluminum die cast supported by a robot arm using a circular saw, and cast aluminum or sintered diamond for die cast cutting suitable for use in the method. It is related to Circular Saw.

[0002]

2. Description of the Related Art The surface of a cast aluminum or die-cast aluminum such as a cylinder block after die cutting is conventionally
As shown in FIG. 3, the work material 12 is planarly cut by the front milling cutter 11. However, in this method, when the unevenness of the cutting surface is large or there is a large protrusion, it is difficult to obtain a relation with the cutting blade. There is a problem that it cannot be processed by one cutting process.

Therefore, as shown in FIG. 4, the work piece 3 is cut at a predetermined depth a by using a circular saw A'having a sintered diamond tip 2 arranged on the outer periphery of the substrate 1. However, in this case, the load is not applied to the entire surface of the blade thickness as shown in Fig. 4 (b), and the axial rake angle of the tip 2 is 0 '(flat tooth). The force (axial component force) to bend the substrate 1 in the direction of the arrow acts, and if the rigidity of the substrate 1 is weak at this time, the cut surface shoots or the circular saw vibrates, causing undulations in the cut surface. There were some difficulties.

By the way, at present, machining of cast aluminum and die-cast products processed by the above-mentioned circular saw is automated and cut by being supported by a robot arm, but the rigidity is low when supported by the robot arm. Since it is a support, vibration is generated by the cutting force, and when the above-mentioned circular saw is used for cutting, satisfactory cutting cannot be achieved.

[0005]

SUMMARY OF THE INVENTION The present invention addresses the above-mentioned situation, and in particular, pays attention to the axial rake angle and the radial rake angle of a sintered diamond tip to reduce the bending stress acting on the substrate and improve the sharpness. The purpose is to maintain the cutting edge strength and to secure a good cutting force even when the robot arm is fixed and held without rigidity like a robot arm.

In order to prolong the life of the cemented carbide tips which are alternately used with the sintered diamond tips, the rake angle of the latter is smaller than the rake angle of the former, and the rake angle of the sintered diamond tips is 10 ° to 15 °. On the other hand, the rake angle of the cemented carbide tip made of cemented carbide is -10 ° on the positive side in the rotation direction.
The tip saw set at -20 ° is actually Koho Sho 58-3289.
The tip saw disclosed in Japanese Patent Publication No. 9 and in which the tip inclination angle and the lateral rake angle of the left and right cutting edge portions are formed such that the side having a lower tooth height on the left and right surfaces of the saw tooth is the leading side in the rotational direction. As disclosed in Japanese Utility Model Laid-Open No. 59-132723, these are selected to cut an axial rake angle and a radial rake angle to cut cast aluminum or the like supported by a robot arm with low rigidity with a good cutting force. It does not adapt to the purpose of the invention.

[0007]

That is, a cutting method suitable for the purpose of the present invention is to cut cast aluminum or die-cast supported on a robot arm by setting an axial rake angle of 0 ° to 5 ° on the outer periphery of a substrate and a radial. Rake angle 5 ° -1
One side is cut by using a circular saw having a sintered diamond tip arranged at 0 °.

According to a second aspect of the present invention, there is provided a circular saw used in the above cutting method, which has an axial rake angle of 0 ° to
This is a configuration of a circular saw in which a sintered diamond tip is arranged on the outer periphery of a substrate with a radial rake angle of 5 ° and a radial rake angle of 5 ° to 10 °.

The cutting edge chips arranged on the outer periphery of the substrate may all be sintered diamond chips, but some of them may be replaced with a few cemented carbide chips made of cemented carbide.

Further, it is more effective if necessary to form the axial rake angle not only in one direction but also in part in the opposite direction.

[0011]

When the axial rake angle of the sintered diamond tip is increased, when the circular saw is cut, a force acts to bend the work piece 3 toward the work piece 3 as shown in FIG. On the other hand, when the axial rake angle is 0 ° (flat teeth), the axial component force (back component force) is a force for bending the substrate 1 as shown in FIG. 4B, as described above. Therefore, when the axial rake angle of the present invention is 5 ° or less, that is, 0 ° to 5 °, a small back force is generated with a cut of 1 to 3 mm and bending is reduced.

Next, as the radial rake angle increases, both the tangential component force (main component force) and the normal component force (feed component force) decrease, and the cutting force is good, but if it exceeds 10 °, the cutting edge strength becomes weak. Cutting edge loss occurs.

However, since automated casting aluminum and die casting are supported by the robot arm, vibration is apt to occur due to the cutting force. Therefore, in order to reduce the tangential force component and the normal force component, the radial rake angle can be reduced. Is preferably increased to some extent, and the radial rake angle of the present invention is preferable in terms of sharpness and chipping of the cutting edge.

For the above reasons, the circular saw of the present invention is suitable for processing cast aluminum and die cast products which are supported by a robot arm and cut.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 and 2 show an example of a circular saw according to the present invention. The circular saw A has a structure in which a sintered diamond tip 2 is arranged on the outer periphery of a substrate 1 by a known method. The radial rake angle indicated by θ ₀ is 5 °
On the other hand, the axial rake angles indicated by θ ₁ and θ ₂ are in the range of 0 ° to 5 °.

In this case, θ ₁ = θ ₂ , but the directions are opposite. This is because when cutting the protruding portion, double-sided cutting occurs instead of single-sided cutting.

Further, in the drawings showing the above-mentioned embodiment, the cutting edge tips are all sintered diamond tips 2, but they may be replaced with cemented carbide tips made of cemented carbide if necessary or alternately.

In the figure, X is a normal component force (feed component force),
Y is tangential force (main force), Z is axial force (back force)
Then, the cutting process is performed by each of these component forces acting.

Next, a comparison between the case of using the circular saw of the present invention and the case of using the conventional circular saw will be shown.

(1) Circular saw outer diameter: 600 mm, substrate: steel, plate thickness: 8 mm, blade width 10 mm, cutting blade: sintered diamond

[0022]

[Table 1]

(2) Using the above-mentioned circular saws, the following work materials were machined under the following cutting conditions. (A) Work material 180 mm × 500 mm (length) (b) Cutting conditions Rotation speed: 1500,1800,2100 (r.p.m.) Feed rate: 20,30,40 (mm / sec) Cutting depth: 1 mm, 3 mm

(3) Results Tables 2, 3 and 4 show the comparison of the tangential force component, the normal force component, and the axial force component in the case of cutting as described above. The unit of each component force is kgf.

[0025]

[Table 2] Margin below

[0026]

[Table 3] Margin below

[0027]

[Table 4]

From the results shown in Tables 2, 3 and 4, the tangential component force and the normal component force are lower in the case of the inventive examples than in the comparative examples, and the cutting force is good, and the substrate It can be seen that the back force component (axial component force) that tends to bend is reduced, and shoots and undulations are prevented.

[0029]

As described above, the present invention has an axial rake angle of 0 ° to 5 ° and a radial rake angle of 5 ° to 10 ° when disposing a sintered diamond tip. By setting the axial rake angle to the above-mentioned angle, it is possible to reduce the bending stress that acts on the substrate in the single-sided cutting of a circular saw, while making the radial rake angle the above-mentioned angle to improve the cutting force and the strength of the cutting edge. It is possible to reduce the damage of the cutting edge by making it possible to perform smooth single-sided cutting even when fixing without rigidity such as a robot arm, and to achieve a practical effect that can smoothly perform automatic machining of cast aluminum or die-cast products. Have.

[Brief description of drawings]

FIG. 1 is a partial front view showing the outline of a circular saw according to the present invention.

FIG. 2 is a schematic partial side view of the circular saw according to the present invention.

FIG. 3 is an explanatory view showing a conventional cutting process of cast aluminum or the like.

FIG. 4 is an explanatory view showing a mode of single-sided cutting, (a) is a schematic perspective view and (b) is a schematic front view.

FIG. 5 is an explanatory view showing a component force action at the time of cutting by an axial rake angle.

[Explanation of symbols] 1 substrate 2 sintered diamond tip 3 work material A circular saw a cut amount

Claims (3)

[Claims] 1. When cutting cast aluminum or die cast supported by a robot arm, an axial rake angle of 0 ° to 5 ° and a radial rake angle of 5 ° to 1 are provided on the outer periphery of a substrate.
A method for single-sided cutting with a circular saw, wherein the circular saw is provided with a sintered diamond tip set at 0 °, and one side is cut. 2. An axial rake angle of 0 ° to the outer periphery of the substrate
A circular saw for casting aluminum or die casting, characterized in that a sintered diamond tip having a 5 ° radial rake angle of 5 ° to 10 ° is provided. 3. A casting aluminum or die-cast cutting sir characterized in that a part of the sintered diamond chip arranged on the outer periphery of the substrate according to claim 2 is replaced with a cemented carbide chip made of cemented carbide. Curacao.